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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '36e6a10fa2c6508af9d7029b943947edcd7e43022c76f8c09c963ead491827bc' 
  AND token = 'QNVX6BzBDs9zoXXbEzrGyDlpgWuNHPGbhsH1MsfC4x8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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