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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4862d034d19943fb611de2cd967c00115592aa1c63c10799e9ecac30b988e0bd' 
  AND token = '8AgCo0hFP1UIhgHQ9VIsdiDv4RAAYxG2mo7L2w6o9Ps=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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