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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b1a84216f2f1a9beaf659b966f576851fc26e04c45e6bafdf63d567ab63ff8df' 
  AND token = 'G9KV23OnXRzj1TpDri0J1aynneWwuq+18RkKE5Nkc6I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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