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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '978ee6525bfffced8b62d83e72f30ea0839458aea3a0d563f9e06169678c0130' 
  AND token = 'eI+uenX5VzVXACT/VJ7N9L56lvPiDpzRp2mABB6vx58=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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