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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7fa9e9cb8b048e4ebbf9588871f270a590c82d0288e590310aca1e0ab48d9601' 
  AND token = 'rhhPPfpY7NlUxeBGSxPYupw9LWP1PgeCcpLI9WTmbDU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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