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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '84b611d72ed90de40c99528d044162c71438ef78dff13e76ee221e89044993d7' 
  AND token = '0ScgtnLAnEXAEvNT0usx8n0qm9Mv8cAzrrps1sR7HuI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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