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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6e2710d71303f3d50d4f72eaaa2f0911ad3f531a58f3eaf2b1acf924d4b5794f' 
  AND token = 'apbld4EyU1T4myYemApvDXGBZYBjXyTtwXMcF9jELMA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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