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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '02d7dca9f7f1d00fa8ef1aa59891b48464bffbf9115f9af15ccc923bb1bc2942' 
  AND token = 'utecbZX9yUwetLVgeWyvipp9MBoojjIslkfv340VpRs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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