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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3a170656311e33a83f1594ea91d8f4b495606fee51b3461b673813951ea276e9' 
  AND token = 'TC9+HEffP4tzO6/+SACJ8LCrr7v5OItNs4ZETnOa6sw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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