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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '693b97e512b3531162806186156fabf7c958826126565d756076a2f7c26663c1' 
  AND token = 'I1lL/ZEH7wBOeVk/m4qkMX/USP9eH6pFIhX0iPUlXjI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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