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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bfbf92836481d9de1a205088e949260b040f93fe22176295be5a9654800dcde8' 
  AND token = '3EHMcsajSDhkFceZOtRQYZw9ILHwbQbXMMG5TZcZYoI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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