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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7de6322bccca8d52a10b49300d3be3482bf14f8058c181b4a7822c7a8e8384f9' 
  AND token = 'zuyrD9rd35iGJ093jbkkqH1VRcfAdtiacmuc0Ec8xbk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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