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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '20ddcc83997895d3cd5b1f822f2f143542127fd335035b2291f9e8a361aa6522' 
  AND token = 'DCN5JtaIZlvRI7vO9xqg9uFjo7QzJ9MF8vD2LmQBsa0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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