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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4e53b31e6e62eb2457daa69bf19ebfb3300429718308c8683845da485493d52b' 
  AND token = 'iYf4PYmjzSbonXnZ+Cz/CP0a1almlFxJYodNL5RODbU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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