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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5aec9512e8d58ace203a758f765a8b6e3508bce7bb71fe763a801f18a06d238f' 
  AND token = 'Z/M/tvSWE2iacxsTf7kN2JrE0cqjmSd22omcIafM5g8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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