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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2f38e1c0be13e1191cce69e1d292a20f645c915e6c1bd0f58ea8f2c915483ed4' 
  AND token = 'kpgQqH1wytoWU99TP9tllx6/4xe63lIggXHsmB7EHJY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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