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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3cfa1e2d1a79c5d4d9cdd1e7cfaae8f9d8716f6ab2408c1c873ebabcd4109302' 
  AND token = 'wUfDdLZ44RETGRk3FDkj2UPNmpPKNetCOjjntL6V3sU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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