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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e948b0d86032a7bea82906784bdb59085ad1edc889b7973250ccccf897f4a944' 
  AND token = 'b0mI1L/r0c7On5vKrLitpKItmzsgy8L0rEo4MpvMI+4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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