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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9ad05c63cbe8cf2df69ed8ce65f7249cb11a8b3fbb37cfd58d3f19f5ec63a7c7' 
  AND token = '9yk7mP6i/V2MC47TclccQATHFZQEg0RWm+BQiQkdyQ8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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