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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b84063d31cc077f1a6bf85e4c4476cb586e5663f00e02d071607b10abcd81c9f' 
  AND token = 'rcdaZHHNqSMA+slvzto/iN5fHrPTUt9rQap+aGFfCtU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00060

JSON explain

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