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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '83b6811c78e7631b88cb0e843dd9be383e255f526a178153505005c5d2f7d700' 
  AND token = 'LFQUAuADKDtTi0sj+vjX6H9mmXwnqOX2jMm+40RXbro=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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