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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6f8f1cb00b1e6fbb53f718cd26c93b20c8e5080892ab6b3d883336719eeff7a6' 
  AND token = 'nCLRrpp/n9FWr0G/mrJ/FUAkASvJ7RlHxX0Cr0zZNxc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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