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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bde8b3583985f6861aab3657649e58f373809cbdc09aa4475e688797e17bb0a1' 
  AND token = '9D7Q2YRacIYbQcg0qYA6oMv5cNL24oHcQ26u6ImnDuU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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