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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '309e11ba90f3074a56ddd91a08ebe28a23d7af8193894a5415c605fa55fe6c2e' 
  AND token = 'OestpAHwDGWKCLqlsUn/KnpgCqhjLs25B0o7m9X3nn8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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