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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd2cc31f99ff3ac68b3e81b1eed33c839565850744f6b633fc37ee3494cb74a92' 
  AND token = 'RXSrKA6Wf6/T3mv1VIuRYL19jzF6imxE5xSYj+Xd6oc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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