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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3d92e1f9479a5dfb9a48788b0bcea65be20d38c5db354985ed2a17e3c441ba27' 
  AND token = 'R7rtKrmLZFffJuXUrLTkX3EdNKHQvP3T07c3o3nTylU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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