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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '43f9a7b5e3eb669db82729ccea7d6fdb55cb5295296798c8372894c8fc7d832e' 
  AND token = '+KpqluOLibfIRfZzGtO+R5ki7WfNE6Mq/2/oo9cxALE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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