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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '08c4ad9db7e49a2b2fdb549011ca06b33fe9b63060a5de1522cbcbf5c3e08a9a' 
  AND token = 'Z0V/fgHCyruJmP9unn8YOlq5bWdZOHI0csZJpiaxnlI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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