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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cdeaa02acc6228324e06125abcab216e7c89685b4af5a353c11e48451b7cfa5b' 
  AND token = 'b1etHMhq2VF20UiEfSHc4Wf8K7xiIV4Z2oquE89GOCc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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