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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '573e8b6f08276ce17d8cea40c3efe15b1561f6987db633e7846cff26ce0e0d7a' 
  AND token = 'FyK5GXwM4vgdw7snqf1uuBLtpKTB3ZYrw4yz3e1JMNU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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