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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4e8820ebd83cccc57661dc0f9854c9ca1e3ef171894935617ff1c536f76a0d6d' 
  AND token = 'dq59/XLX2Md5QvTA6kxVORH9IvPXgaCekaWDCOrjysM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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