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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7aacd71f18386409ba9c032988531250ce056d4d1776334bccef6769dae08197' 
  AND token = 'Zj6ooHWDDdFwmLn5Eyx5t1NRgrUlxysMIS4L5EJWro0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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