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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '953c546a394a688ad02ac75fcabe241bf0581dda66268f3acbc9f8fbd2a9f11c' 
  AND token = 'sA8oTWyqMlDfDOZLDIOoEyJr642KkbL++bJ0I0h5kPg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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