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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a794ade859c106a96d702a2f6234a98246b57eae4c6e50f7d6e2ed23ac13ffbb' 
  AND token = 'S3wf4JsYuWwwMxQLdKZyt9voS8VmMjm50ihkLU6HnbY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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