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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6c84cc5304f139ec4bd71dced3129bbd92ce4eb52693af38c30d124bb91dc8c0' 
  AND token = 'BM9YnM3oX+VSwTNdIsM2JftAJlDL0rRA27bEdoeaHNo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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