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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '25312c4c8b07eab1f7a034b8cda2dab9e68407a63f11c4b7995c1ccb627922db' 
  AND token = '3ioEA9c1lJ0q86grxm+JFEML4fnc4+h+Hj5yaLLyx/I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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