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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2de2126669732aea16d468c36c222166ba35d84a368d08d5a1f1e59bc48d5310' 
  AND token = '9rFW2wSg0lwQsoqZKgFKD+GmhduqgreDiy1+3Icqavk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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