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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e7d0c693c0c30ace66e0171a60b393130853ee4a76f54aebb11ea9fb6a4445ea' 
  AND token = 't//xecfosb/5O8q4YHLNYJ5ecGpaDfYJmIwGmzizN2w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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