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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9927823029f7820e4e124dc17daf90fa9c190780eab56f5d75f853792a4ff3f9' 
  AND token = '6z8MpyALyEHtUNgqH3px69pQPdc8WJtQDMbYK4hw1+g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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