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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e5a8377bc581b01509a272282168ffea06126927cc7d468eddec0c0acab0f1b0' 
  AND token = '1L8xV+Wfn7LnY8TV92M+SErkOE4Sz17+WzS82AfumRU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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