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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '11dd19ff49d49d54e77aff40173fab3e01cf166349a64d19fc688cb779ce16df' 
  AND token = 'bKU4fREcpgIGYLXABaQXv3iGzxNNTtXckt8FqZ53uk0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00059

JSON explain

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