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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'acc38b2b9778f08a8900b930dc425b55f92ec348c22a425bdbf5c077ef6033b8' 
  AND token = '1HMYtLO7dMj5olGdc66xTEyrKNI1CwnYS6USaHb/3gE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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