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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3f0bf11f9ce7e2b6e6056d2e5041408eb25cd4842bd45bdbf9aeafa547ffd3a6' 
  AND token = 'm3y0KArj04WuujXaD++KGcJv+R47wBYrq0H8k3/2gp0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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