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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e43284d49c3ba4ff9a903216e50ccb5c867505f998f12672126e72f07c000ed1' 
  AND token = 'RmQNXe/EGTHC2W44T90wWY8TwQ/aWQ3YowfP7ceed3s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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