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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9d56422940fcf60765c75181dd391f7b31f9b06ee095092430147a5311f1db43' 
  AND token = 'UDLXoDxDWGOXsQ8cdMHUp6552xShUm+2CsdxQ/AsuTk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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