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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1f66436d40461dfc1a3cfb99f9f17b7b29d63f0475c69e85a97a5e2d5950b817' 
  AND token = '/AA/lv9kY31jkGq5dEL2i8/TINZ3nJEix/L0e76tXPs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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