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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '83dba27afe1a811232ef66ec13c998d408a6a1af26707469649043e39f342b4d' 
  AND token = 'JTXo60/0mquMDGosSBvpsiwGuESmkYY5xpIaj6zSfdA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00057

JSON explain

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