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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7308da786165b3ab6c7f621e340def3ef28bac57d6473f25a816d1f29cbb5f87' 
  AND token = 'FcT7m2WC+x+FHPnpGOShkmpfV9VWWCWWBkDUSTNVm+E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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