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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cb87dcf67ee9e195c16facaf4b6ce96dcb8fb560002977d3b37143dcd3526a63' 
  AND token = '4S9rzJKB74nXQ+Hz8e6Ug28t4Mp7zhuWs9H/KDz2EWg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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