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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ad4631652c68a072fcce3da9d6993f3ecf544ddd1c7bfb05a75cc09fbbcdde33' 
  AND token = 'icn9z4uubc8SOjQUwkIAGBuqMgF8kmtSd/+eBYNhVWU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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