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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e864ab3c280ee5e0ad33875b3f606dc20a5a9383e3c2068779bc107e10098802' 
  AND token = 'O+xP+M1cNf3a+I4kYjFf5WYqe2QTrzzgn6zbQlqj1qE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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