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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9b6aca6dc2e8650ac23ed8c32524edabd5ab29eef1d5a2d44d1d583ed71eecc6' 
  AND token = 'w2mY3ajZ9ZVk1JOJ+UM3yvdxVAUH4MqCXozkw2ZsImI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}