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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '34120ac42db551516137e1d7f027f5f62c44b4f8e082f53b53d0847f886366cb' 
  AND token = '64o/L2zGY6oZItWVR9ETSO4+IFb7DhkqxkckDjwYXn8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00066

JSON explain

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