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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd494a8ddc2e771fc1b69ad48d989851012ef330366d02662dda758bc4bd8cedc' 
  AND token = 'Bj35CeOOB78Y9jeeYzmkIHSpc4Bin/jMo/2sQNZElsc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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