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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '109551c4ec8aa2ff8d4eaf3e3f48c41f739a8938698ea220c017c623cb0bdbbc' 
  AND token = 'EaQ2adzsB50sgfSqA+5YqDY+7Jrpj54hoZFmGdJmESo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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