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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a691368c94ae3e81e401149273467201b528e12d3e5fbdb85549c8fa59e8bf53' 
  AND token = 'Ig3jtU8DCAGSncU/lYS2JXYTEvAmIsotN8834jHy5OE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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