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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fed3fcff305c15c450f35b96b606251e0ca221b002cf920b00762d7183bd8e7b' 
  AND token = 'jf+y+pp0KTIydf406mVSp9z80JxA8Cci36JVWyImlpQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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