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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd6bee0f71d60ddde54ee1eeac422c68e23e97ab88e4acc938580e61c46017693' 
  AND token = 'gVYyTEJvE2GBd/FaK+5AyJ5rQnHLliWFxisS9Ruun0g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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