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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1541ab52019cf8d3248cbe99ed33f31da8b8964a30ed4e2f2270952cc1e517c2' 
  AND token = 'B628NFvNx5SgAv5ZufAKh6fY4Lym9Mnj5JN9fcW7lG0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00063

JSON explain

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