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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0b6c94ed42901729bc5e9725de4892c184fef98b28ae3c3adeb7f1aa760d6ba2' 
  AND token = 'uBFP/6TWlNdnucJr2nPST+Mys7YCOgJ34VyFQYeWs0w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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