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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd9f32e1a34954ad507b5f7c9e07f304afd40c7402be34b4e7aeb553f655d4e5f' 
  AND token = 'itVgaghGfYrVhIYUt3OHsoPnp6aPL31jLDfGHwP4j8w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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