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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f7ac1c02f3fb8ad00d8453e7515306ddf7314779d5078c9fde2b9feba92b04e3' 
  AND token = 'uEVLvb6deL6t9iXM5nb4v9Vai/Zv1iT8Di25z5hP+tI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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