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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9fd61f3e42e76bb29e705d66d4d464e22ce5a234700b594051e1435b1fdeea05' 
  AND token = 'Fog9qLAbD1AzeE4SzTly7cMddAQH+FRKl9J2xBDXFvM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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