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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1bc1ec956a8d48fb63034fca9f47526e8c6155470b0e63793ef17fef69eb1f3f' 
  AND token = 'TloUMwEE6TJU/GZFNb9lGIsfKUl742fvX0trQYLBbr0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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