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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd560e263629c228523a99dc586a5fde1d8a076a6f5f52345dc790db3d826c10e' 
  AND token = 'C/r/KW5zRXgMQ9oQIzEM7fwJG6OCxzY+cRJtRTOS9Lw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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