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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2a62b788055b66ab627dab7ce3f5e79e88270476942bd4b757b41a46a2767d3e' 
  AND token = 'jQwagAL+ABLr5AjcZpFJHuPD4Wcp8kpv9tQH9Mu5jrM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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