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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fa3ed1f24e87c8d73ebc9b605e0f202b96bcd8dd9fbeb27fc78558f1898a052c' 
  AND token = '77f6+NlJBlD0CmwRRWGL9Zb0zP8pKCcyURpoa0LU+xE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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