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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7354e6bce8a4902a53783e4ddf0a3d15aff37199e6d40a7976c59e4972d58a84' 
  AND token = 'aOy9Ki2dk/5lZK3RR/xCna4Fky+IDLmDIoNNuSolDb8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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