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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8ca6008edced32a73f6d811fe5be02b8089b4b552e0bdbbaf20fd4786e100bfe' 
  AND token = 'DuW8xM9LK6L6v4zx0aJwRZx01WQrB9y/uekAhLBpWIg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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