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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b4d7429d7c4b256cdabba4df6c2066a81aae17ba7746b1ad02da319b9161d909' 
  AND token = 'hHBkEuMQkpDnPff1+7VbcdEe3eE1bcenaEmg34wN2VE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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