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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bc75882e861bf165569375f58eba31d7768af6ed020260c553a15e507870b05a' 
  AND token = 'DRPj0O6QJxFLEp1McnV+Jv53ToyyVZg2izl4UV0533o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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