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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ca31a331f1ea916f2815e0cfe56ca906c6cd6740501239eb7dc50daac520b422' 
  AND token = '0t8eCzwoCDY4B9YbBmlKwUc8a1GLh43Ql6vSM6L9CFU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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