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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e513c6eed0b625f117cbc877db1a63e73ce08ed4bcec1062aeb4d79d2f7508bb' 
  AND token = 'ISCYQneGQwMaVZK+a064BWsKcxEHoysbCk3GBgZbRLs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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