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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '73422e5e82120a51ee2eb3ed77ec48c2e7e6aea6392702cb4fa4f64f1e2f6652' 
  AND token = '2ZFU1pATkZtVkUdA9ApAXzjffHQAkaFy21JiRn2zAvc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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