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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '60ea0c747cef975a17d6e36c59b77307c7fcd494fc62d1b66d6df599c43bd94b' 
  AND token = '1abvXS2LsA6Mxac/aMg/T2ftVi3TZ/oiIi//JAsb8Bk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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