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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3bc677dc954af4e362d0b3c83bfbdebe1b8b7613ca647452283ab826e8f9ca33' 
  AND token = 'ZPL+iRerHHHnPhmxB7f4oVfvxBcP/28DV1KnkDfXggs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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