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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '511bddf33ae99982be3e7b91fc5c299ccbcc8b1f3464c41f01430d326735bae7' 
  AND token = 'MXLkwt6oVOhJX6Y6qwx5uIVJCUjif3AFPFr2V5bSTN8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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